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Tone signal generator for producing multioperator tone signals using an operator circuit including a waveform generator, a selector and an enveloper

United States Patent

5,665,929
September 9, 1997
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A frequency modulation (FM) tone signal generator for generating a FM tone signal is disclosed. The tone signal generator includes a waveform generator having a plurality of wave tables, a selector and an enveloper. The waveform generator furnishes a waveform signal in response to a phase angle address signal. Each wave table stores a different waveform. The selector selects one of the wave tables in response to a plurality of selection signals such that the selected wave table largely provides the waveform signal upon being addressed largely by the phase angle address signal. Selection of the selected wave table varies with each selection signal. The enveloper impresses an envelope signal on the waveform signal. The envelope signal is used as a carrier or modulator for generating the FM tone signal.
Dong; Qiujie (Austin, TX), Jenkins; Michael V. (Austin, TX), Bernadas; Salvador R. (Austin, TX)
Crystal Semiconductor Corporation (Austin, TX)
08/ 497,035
June 30, 1995
The United States Government has rights in this invention pursuant to blanket license agreement No. DE AC05-840R21400 awarded by United States Department of Energy Contract with Martin Marietta Energy Systems, Inc.